While working with NeHe #33 tutorial, I tried setting glMatrixMode(GL_PROJECTION) with some standard resolutions, (0, 800, 0, 600), etc.
However, when I invoke this call in the init portion of the code, the rotating sprites disappear. I have no idea how what the coordinates correspond to, when rendering the GL_QUADS.

Would anyone be able to show me how to set this up whilst having the glMatrixMode set to GL_PROJECTION?